Automatic centering instrument



L. G. REPPELL AUTOMATIC CENTERING INSTRUMENT Filed June 25, 1927 ATTORNEY Patented Feb. 28, 1928.

uN -frsn LAWRENCE GLREIBP EIiL,'OF.KA1\TSAS QITY, MISSOURI. l

ancroivijirioffonnzrnnine meantime;

I Applicatioii fiiedauiieeb, i927.,seriai 2o1;472.

My invention relates autoi'natic centering instruments. 7

particularly to dividers inatic centering'means.

One or the ob ects with which the center of my provide an instrument of the to improvements in It relates provided with autoinvention is to kind described between two points may be easily,automatically and quickly determined.

A further objectjof my 'invention is to provide an instrument of novel construction with which the distance and quickly may be easily indicated.

provide an instrument o which s simple, cheap, get out of order, whichv operated, which is reliable in it and winch, when not in use can in compact form.

hereinafter fully In the accompanying lustrates the preferred invention,

describe between two points determined and Still another object of my i-nvention is to f the kind described, durable, not likely to is easily and qu ckly s operation,

be disposed embodiment of my Fig. 1 is a plan viewot my improved instrument shown in an op broken away.

nut being partly erative position, the

Fig. 2 is an end elevation of the same. Fig. 3 is an enlarged section on 33 of Fig. 1.

the line Fig. l is an enlarged section on the line H of Fig. 1.

Fig. 5 is a plan view Fig. 3, the nut being r Similar reference similar parts in My improved instrument is provi 2, which are pivoted, adjas,byapin3toa e end thereof.

two arms 1 and of what is shown in emoved.

a'tions'1'3 and 1a which maybe I the adjacent side of the guide member {at v the arms 1 an There may be slidably' nio unted (an at guide member-4 an indicating'j plate 10' through which the pin 5 extends, "The plate 10 may be. provided at oppositefendsi'w'ith inwardly turned pointed lips Hand 12'', Fig. I

center of the pin 5 ,and which are adaptedito overlap the adjacent-side of the guide mem ber 41- and to respectivelyindicate the gradupr'ovided on opposite sides respectively of the slot-7', Figs. 131x15. V M

' Two links 15 and 16 ends pivoted have one set oftheir to the pint; between the plate 10 and thehead8 of thejpin 5. .Thelinks 15 and 16 are respectively p 17 and 18 to the arms 1 and2 atequal dis tances, preferably, fromfthe pin 5 and from thepin 3.

ivoted by pins Y Theendsof ui mt -'1 an wit s n I the pin 3 are provided 'respect'i v'ely with pointed indicating devices .19 andQO extend ing respectively atangl es to the bodies of The graduations 13 respectively represent distances from either indicating pointer 19 01-20 to the point of the head 8 of the pin 5 in dififerent positions of the arms 1 and 2.

The graduations 14; represent of the guide member 4:, distant from the pin 3, to the point of the head 8.

In using the device to find "the center between two points, set the pointers '19 and 20 actual dis- V tances'or measurements taken from the end at the two points, and the links 15 and 16 characters designatethe different views.

ded with Said guide member 4; may be a flat bar on which is longitudinally a marker, comprising, which extends through slot 7 with which be provided. One end the gui adjustably prefer ably mounted a pin 5 and has a square portion 6 slidably mounted in a longitudinal of the pin de member 4 may 5hasa pointed head 8 withiwhich indentations or marks may be made.

for holding the pin 5 in it may be adjusted. I

the position uide member t to which 9 graduations 14' the distance the point of will slidethe pin 5 in the slot 7 to'a position equi-distant from the pointers 19 and 20 and the two points. By pressing against the nut 9 or .the'upper end of the pin 5,-the point of the head 8 will make" a mark, which is centrally between the two points.

Thelip 11 will indicate onthe graduations'13 the distance between the" point of the head 8 and either of the two'points. Thus the middle of a board may be readily determined by setting the pointers '19 and 20 of the arms 1 and 2 at the edges of the board, and the point of the head 8 of the pin 5 will be in the exact center board. Y

The indicating lip 12 will indicate on h t e head 8' from. the end of the guide member 4 distant from the pin 3. By having the inof the the dicating pointers 19 and 20 extending re- 1 spectively at angles to the bodies of the arms 7 claims, 3 may be the I graduations on 1 and 2, said pointers may be made to become engaged with and easily held with one hand against opposite edges of a board, other hand of the operator will so that the be free to operate the marker pin 5.,

I do not limit my invention to thestructure shown and described, as many modifications, within the scope of the appended made without departing from the spirit of my invention.

1. In an instrument of the kind described, a graduated guide member, a marker movable thereon and arranged to register with said guide member, an

arm pivoted to said member and having an vindicatingdevice, and a link pivoted to said arm and to said marker, said graduations represent ng respectively different d stances corresponding to different distances between 1 said device and said marker, when said arm v the graduations on said is swung todifi'erent positions with respect to the said member. 1

2 In an instrument of the kind described, a graduated guide member, a marker movable thereon and arranged to register with guide member, two

- arms pivoted; to said member and having each angindicating device,'aiid two links piv-,

oted to said marker and respectively pivoted to said arms, said graduations representing arms two indicating pivoted to said marker and respectively pivoted tosaid arms.

different distances between said marker and either of said devices, when said arms'are swung to different positions with respect to said: member. p

3. Inian instrument of the kind described, a guide member, a marker movable thereon and, arranged to register with the gradua- 'tions onsaid guide member, two arms pivoted to said member and having extending respectively therefrom at'like sides and in like directions parallel with the axis of said pointers, and two links tween said marker and e'ither of said indicatingpointers, whensaid arms are swung to different positions with respect to'said member. 1 I

In testimony whereof I have signed my name to this specification.

LAWRENCE E'PPEL i 

